Complex thermal analysis and runaway reaction of 2,2′-azobis (isobutyronitrile) using DSC, STA, VSP2, and GC/MS

2019 ◽  
Vol 60 ◽  
pp. 87-95 ◽  
Author(s):  
Peng-Fei Gao ◽  
Shang-Hao Liu ◽  
Bin Zhang ◽  
Chen-Rui Cao ◽  
Chi-Min Shu
Keyword(s):  
Thermal Analysis ◽  
Runaway Reaction ◽  
Complex Thermal Analysis

scholarly journals Mössbauer, XRD, and Complex Thermal Analysis of the Hydration of Cement with Fly Ash

2013 ◽  
Vol 2013 ◽  
pp. 1-9 ◽  
Author(s):  
Vili Lilkov ◽  
Ognyan Petrov ◽  
Yana Tzvetanova ◽  
Plamen Savov ◽  
Milen Kadiyski
Keyword(s):  
Thermal Analysis ◽  
High Temperature ◽  
Fly Ash ◽  
Octahedral Coordination ◽  
Tetrahedral Coordination ◽  
Cement Pastes ◽  
Pozzolanic Properties ◽  
Tetrahedral Iron ◽  
Complex Thermal Analysis ◽  
Cement Mixtures

Hydration of cement with and without fly ash is studied with Mössbauer spectroscopy, XRD, and thermal analysis. Iron in cement is present as Fe3+-ions and occupies two octahedral positions, with close isomer shifts and quadrupole splittings. Iron in fly ash is present as Fe2+and Fe3+, and the Mössbauer spectra display three doublets—two for Fe3+in octahedral coordination and one for Fe2+. A third doublet was registered in the hydrating plain cement pastes after the 5th day, due to Fe3+in tetrahedral coordination in the structure of the newly formed monosulphate aluminate. In cement pastes with fly ash, the doublet of tetrahedral iron is formed earlier because the quantity of ettringite and portlandite is low and more monosulphate crystallizes. No Fe(OH)3phase forms during hydration of C4AF. The fly ash displays pozzolanic properties, which lead to lowering of the portlandite quantity in the cement mixtures and increasing of the high temperature products.

First evidence of formation of stable DBU Zn-phthalocyanine complexes: synthesis and characterization

2005 ◽  
Vol 09 (07) ◽  
pp. 519-527 ◽  
Author(s):  
Roberta Del Sole ◽  
Agnese De Luca ◽  
Giuseppe Mele ◽  
Giuseppe Vasapollo
Keyword(s):  
Thermal Analysis ◽  
Axial Ligand ◽  
Synthesis And Characterization ◽  
One Pot ◽  
Strong Base ◽  
Pyridine Complex ◽  
The Stability ◽  
First Time ◽  
Complex Thermal Analysis

Novel Zn (II) phthalocyanine and naphthalocyanine DBU complexes have been prepared in a one-pot synthesis reacting phthalonitrile precursors with an excess of DBU (1,8-diazabicyclo[5.4.0]undec-7-ene). For the first time, it has been well evidenced that DBU played the role of coordinating axial ligand together with the well known role of strong base. Also, DBU complexes showed better solubility in organic solvents due to the coordination of the bulky axial DBU ligand, compared to the Zn (II) phthalocyanines and naphthalocyanines without coordinated DBU. The coordinating properties of DBU toward ZnPcs (DBU free) complexes have also been investigated along with the ZnPc (pyridine) complex. Thermal analysis results reflecting the stability of the synthesized complexes under air are also presented.

scholarly journals Рhysical and chemical analyses of the adsorption capacity of transcarpathian clinoptilolite

2021 ◽  
Vol 4 (1) ◽  
pp. 19-25
Author(s):  
V. V. Kochubei ◽  
◽  
S. G. Yaholnyk ◽  
Y. V. Yaremchuk ◽  
A. I. Manchak ◽  
...  
Keyword(s):  
Thermal Analysis ◽  
Water Vapor ◽  
Adsorption Capacity ◽  
Chemical Analyses ◽  
Liquid Ratio ◽  
Naturally Occurring ◽  
Adsorption Of Water ◽  
Solid Liquid ◽  
Adsorption Of Water Vapor ◽  
Complex Thermal Analysis

The IR spectroscopy and complex thermal analysis were used to analyze the adsorption capacity of Transcarpathian clinoptilolite, both naturally occurring and activated, relative to water vapor. It was found that activation of clinoptilolite with an H2SO4 25 %-solution causes dealumination and the appearance of additional adsorption centers, allowing maximum adsorption of water vapor. Activation with a 5 % solution of HCl at the 1:10 solid-liquid ratio ensures the significant dealumination of the mineral with no breakdown of its structure and the occurrence of transient pores and macropores in this mineral. Due to such activation clinoptilolite is far more able to absorb molecules of the green dye.

Description of thermal breakdown of polymers and copolymers using complex thermal analysis

1979 ◽  
Vol 21 (11) ◽  
pp. 2935
Author(s):  
T. Székely ◽  
F. Till ◽  
G. Veregi ◽  
M. Blazsó
Keyword(s):  
Thermal Analysis ◽  
Thermal Breakdown ◽  
Complex Thermal Analysis

Complex thermal analysis of solid rocket propellants

2019 ◽  
Author(s):  
Marcin Cegła ◽  
Piotr Ruliński ◽  
Janusz Zmywaczyk ◽  
Piotr Koniorczyk
Keyword(s):  
Thermal Analysis ◽  
Rocket Propellants ◽  
Solid Rocket ◽  
Solid Rocket Propellants ◽  
Complex Thermal Analysis

Physical-Chemical Studies and Evaluation of the Suitability of Chernoyarskoe Deposit’s Diatomite for the Synthesis of Foam Glass

2020 ◽  
Vol 299 ◽  
pp. 188-193
Author(s):  
Elena A. Yatsenko ◽  
V.A. Smoliy ◽  
A.A. Chumakov
Keyword(s):  
Thermal Analysis ◽  
Foam Glass ◽  
Microscopic Analysis ◽  
Mineralogical Composition ◽  
Raw Material ◽  
Polymorphic Transformations ◽  
Chemical Methods ◽  
Physical Chemical ◽  
Chemical Studies ◽  
Complex Thermal Analysis

The macro- and microstructure is investigated by microscopic analysis methods. The elemental, granulo-metric and mineralogical composition of diatomite of the Chernoyarskoe deposit is determined. As a result of complex thermal analysis, using a differential scanning calorimeter, intervals of continuous dehydration of diatomite were studied, as well as polymorphic transformations of quartz and other minerals. Physical-chemical methods of research have discovered that diatomite of the Chernoyarskoe deposit contains amorphous silica, quartzite, clay impurities, opal and minor amounts of calcite, mica, zeolite, and so this diatomite is a promising raw material for the synthesis of foam glass.

Skrew Rolling of Balls in Multiple Helical Impressions

2013 ◽  
Vol 58 (4) ◽  
pp. 1071-1076 ◽  
Author(s):  
J. Tomczak ◽  
Z. Pater ◽  
J. Bartnicki
Keyword(s):  
Finite Element Method ◽  
Thermal Analysis ◽  
Finite Element ◽  
Numerical Analysis ◽  
Experimental Research ◽  
Three Dimensional ◽  
Rolling Process ◽  
Skew Rolling ◽  
Made In ◽  
Complex Thermal Analysis

Abstract This paper presents results of theoretical and experimental research on skew rolling process of balls with diameter ;30 mm in multiple helical tools. Numerical analysis of the process was conducted basing on finite element method (FEM), using the commercial software Simufact Forming in version 10.0. Simulations were made in the three-dimensional state of strain with consideration of complex thermal analysis, due to which progression of the products shape was determined. Distributions of strains and temperatures as well as the process force parameters were also determined. The results of numerical calculations were experimentally verified in laboratory conditions. The obtained results confirmed the possibility of semi-finished products of balls type manufacturing by means of rolling in multiple helical impressions.

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